73018021 has 4 divisors (see below), whose sum is σ = 73036000. Its totient is φ = 73000044.

The previous prime is 73018019. The next prime is 73018061. The reversal of 73018021 is 12081037.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 73018021 - 2¹ = 73018019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 73017983 and 73018001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73018061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310 + ... + 12088.

It is an arithmetic number, because the mean of its divisors is an integer number (18259000).

Almost surely, 2^73018021 is an apocalyptic number.

It is an amenable number.

73018021 is a deficient number, since it is larger than the sum of its proper divisors (17979).

73018021 is a wasteful number, since it uses less digits than its factorization.

73018021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17978.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 73018021 is about 8545.0582794970. The cubic root of 73018021 is about 417.9683076175.

Adding to 73018021 its reverse (12081037), we get a palindrome (85099058).

The spelling of 73018021 in words is "seventy-three million, eighteen thousand, twenty-one".